From mboxrd@z Thu Jan 1 00:00:00 1970 From: Daniele Palmas Subject: [PATCH 1/1] NET: usb: cdc_mbim: add quirk for supporting Telit LE922A Date: Wed, 7 Dec 2016 14:07:48 +0100 Message-ID: <1481116068-32691-2-git-send-email-dnlplm@gmail.com> References: <1481116068-32691-1-git-send-email-dnlplm@gmail.com> Cc: netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-usb-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Daniele Palmas To: =?UTF-8?q?Bj=C3=B8rn=20Mork?= , Oliver Neukum Return-path: In-Reply-To: <1481116068-32691-1-git-send-email-dnlplm-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> Sender: linux-usb-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: netdev.vger.kernel.org Telit LE922A MBIM based composition does not work properly with altsetting toggle done in cdc_ncm_bind_common. This patch adds CDC_MBIM_FLAG_AVOID_ALTSETTING_TOGGLE quirk to avoid this procedure that, instead, is mandatory for other modems. Signed-off-by: Daniele Palmas --- drivers/net/usb/cdc_mbim.c | 21 +++++++++++++++++++++ drivers/net/usb/cdc_ncm.c | 14 +++++++++----- include/linux/usb/cdc_ncm.h | 3 ++- 3 files changed, 32 insertions(+), 6 deletions(-) diff --git a/drivers/net/usb/cdc_mbim.c b/drivers/net/usb/cdc_mbim.c index 96a5028..3a98f37 100644 --- a/drivers/net/usb/cdc_mbim.c +++ b/drivers/net/usb/cdc_mbim.c @@ -602,6 +602,21 @@ static const struct driver_info cdc_mbim_info_ndp_to_end = { .data = CDC_NCM_FLAG_NDP_TO_END, }; +/* Some modems (e.g. Telit LE922A6) do not work properly with altsetting + * toggle done in cdc_ncm_bind_common. CDC_MBIM_FLAG_AVOID_ALTSETTING_TOGGLE + * flag is used to avoid this procedure. + */ +static const struct driver_info cdc_mbim_info_avoid_altsetting_toggle = { + .description = "CDC MBIM", + .flags = FLAG_NO_SETINT | FLAG_MULTI_PACKET | FLAG_WWAN, + .bind = cdc_mbim_bind, + .unbind = cdc_mbim_unbind, + .manage_power = cdc_mbim_manage_power, + .rx_fixup = cdc_mbim_rx_fixup, + .tx_fixup = cdc_mbim_tx_fixup, + .data = CDC_MBIM_FLAG_AVOID_ALTSETTING_TOGGLE, +}; + static const struct usb_device_id mbim_devs[] = { /* This duplicate NCM entry is intentional. MBIM devices can * be disguised as NCM by default, and this is necessary to @@ -626,6 +641,12 @@ static const struct usb_device_id mbim_devs[] = { { USB_VENDOR_AND_INTERFACE_INFO(0x12d1, USB_CLASS_COMM, USB_CDC_SUBCLASS_MBIM, USB_CDC_PROTO_NONE), .driver_info = (unsigned long)&cdc_mbim_info_ndp_to_end, }, + + /* Telit LE922A6 in MBIM composition */ + { USB_DEVICE_AND_INTERFACE_INFO(0x1bc7, 0x1041, USB_CLASS_COMM, USB_CDC_SUBCLASS_MBIM, USB_CDC_PROTO_NONE), + .driver_info = (unsigned long)&cdc_mbim_info_avoid_altsetting_toggle, + }, + /* default entry */ { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_MBIM, USB_CDC_PROTO_NONE), .driver_info = (unsigned long)&cdc_mbim_info_zlp, diff --git a/drivers/net/usb/cdc_ncm.c b/drivers/net/usb/cdc_ncm.c index 877c951..afbfc0f 100644 --- a/drivers/net/usb/cdc_ncm.c +++ b/drivers/net/usb/cdc_ncm.c @@ -839,11 +839,18 @@ int cdc_ncm_bind_common(struct usbnet *dev, struct usb_interface *intf, u8 data_ iface_no = ctx->data->cur_altsetting->desc.bInterfaceNumber; + /* Device-specific flags */ + ctx->drvflags = drvflags; + /* Reset data interface. Some devices will not reset properly * unless they are configured first. Toggle the altsetting to - * force a reset + * force a reset. + * Some other devices do not work properly with this procedure + * that can be avoided using quirk CDC_MBIM_FLAG_AVOID_ALTSETTING_TOGGLE */ - usb_set_interface(dev->udev, iface_no, data_altsetting); + if (!(ctx->drvflags & CDC_MBIM_FLAG_AVOID_ALTSETTING_TOGGLE)) + usb_set_interface(dev->udev, iface_no, data_altsetting); + temp = usb_set_interface(dev->udev, iface_no, 0); if (temp) { dev_dbg(&intf->dev, "set interface failed\n"); @@ -890,9 +897,6 @@ int cdc_ncm_bind_common(struct usbnet *dev, struct usb_interface *intf, u8 data_ /* finish setting up the device specific data */ cdc_ncm_setup(dev); - /* Device-specific flags */ - ctx->drvflags = drvflags;